/*
 * $Id: TreeRolloverController.java 3100 2008-10-14 22:33:10Z rah003 $
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.rollover;

import java.awt.Cursor;
import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.JTree;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;

/**
 * listens to rollover properties. Repaints effected component regions. Updates
 * link cursor.
 * 
 * @author Jeanette Winzenburg
 */
public class TreeRolloverController<T extends JTree> extends RolloverController<T> {

	private Cursor oldCursor;

	// -------------------------------------JTree rollover

	@Override
	protected void rollover(Point oldLocation, Point newLocation) {
		// JW: conditional repaint not working?
		// component.repaint();
		if (oldLocation != null) {
			Rectangle r = component.getRowBounds(oldLocation.y);
			if (r != null) {
				r.x = 0;
				r.width = component.getWidth();
				component.repaint(r);
			}
		}
		if (newLocation != null) {
			Rectangle r = component.getRowBounds(newLocation.y);
			if (r != null) {
				r.x = 0;
				r.width = component.getWidth();
				component.repaint(r);
			}
		}
		setRolloverCursor(newLocation);
	}

	private void setRolloverCursor(Point location) {
		if (hasRollover(location)) {
			if (oldCursor == null) {
				oldCursor = component.getCursor();
				component.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
			}
		} else {
			if (oldCursor != null) {
				component.setCursor(oldCursor);
				oldCursor = null;
			}
		}

	}

	@Override
	protected RolloverRenderer getRolloverRenderer(Point location, boolean prepare) {
		TreeCellRenderer renderer = component.getCellRenderer();
		RolloverRenderer rollover = renderer instanceof RolloverRenderer ? (RolloverRenderer) renderer : null;
		if ((rollover != null) && !rollover.isEnabled()) {
			rollover = null;
		}
		if ((rollover != null) && prepare) {
			TreePath path = component.getPathForRow(location.y);
			Object element = path != null ? path.getLastPathComponent() : null;
			renderer.getTreeCellRendererComponent(component, element, false, false, false, location.y, false);
		}
		return rollover;
	}

	@Override
	protected Point getFocusedCell() {
		// TODO Auto-generated method stub
		return null;
	}

}